* {
    padding: 0;
    margin: 0;
}

.focus {
    position: relative;
    width: 721px;
    height: 455px;
    background-color: pink;
    margin: 10px auto;
    overflow: hidden;
}

.arrow-l {
    float: left;
}

.arrow-r {
    right: 0;
}

.arrow-l,
.arrow-r {
    display: none;
    position: absolute;
    width: 40px;
    height: 35px;
    text-align: center;
    top: 45%;
    padding-top: 5px;
    background-color: rgb(0, 0, 0, .3);
    z-index: 2;
}

.focus ul {
    position: absolute;
    top: 0;
    left: 0;
    width: 500%;
    list-style: none;
}

.focus ul li {
    float: left;
}

.circle {
    position: absolute;
    bottom: 20px;
    left: 45%;
}

.circle li {
    float: left;
    list-style: none;
    width: 10px;
    height: 10px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    margin-left: 8px;
    cursor: pointer;
}

.circle .current {
    background-color: #fff;
}